Upgrade the lock on your door to increase the number of keyholes in it. This will make it more difficult for attackers to break into your dungeon. To make an upgrade, tap on the castle icon in your dungeon (or simply swipe downwards).
Use Edit Mode to design the best defense for your dungeon, or buy the pre-made design with the best defense right out of the box. You can always change the type of traps you have by tapping "Change Traps" icon in the Edit Mode.
3. Gem Defense Chance
If an intruder reaches your totem, the game is not over! They need to spin a spinner and land the pointer in the green zone to steal a gem.